"The separation was entirely mutual," a rep for the former couple tells Us Weekly. (The Smash actress, 43, and the actor/TV producer, 44, announced Tuesday they'd separated after 10 years of marriage.) "They have been a couple for twenty years, and the nature of their relationship simply changed over time."

A representative for Messing and Zelman tells Us, "in the short term they plan on continuing to live together with their son, then gradually transition into a new living situation. They have no immediate plans for divorce."

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